Sieve for grain-separators



J. ALOLSON. Sieve for Grain Separators.

No. 232,751. Patented Sept. 28,1880.

Fig- ,2

O O O UNITED STATES PATENT Orricn.

JOHN A; OLSON, OF VASA, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO LUOIUS F.HUBBARD, OF RED WING, MINNESOTA.

SIEVE FOR GRAlN-SEPARATORS.

SPECIFICATION forming part of Letters Patent No. 232,751, datedSeptember 28, 1880. Application filed J annary 24, 1880.

To all whom it may concern:

Be it known that I, JOHN A. 0LsoN, of Vasa, in the county of Goodhue andState of Minnesota, have invented certain new and useful Improvements inSieves for Grain-Separators; and I do hereby declare that the followingis a full, clear, and exact description thereof, which will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, which form apart of this specification.

This invention contemplates improvements in grain sieves or riddles; andit consists of a sheet-metal plate having transverse rows ofsubstantially V-formed cuts, with their apices turned alternately inopposite directions and interjacent, the rows of tongues formed by saidcuts being alternately bent upward and downward to form teeth ordeflectors, substantially as hereinafter more fully set forth.

In the drawings, Figure 1 is a perspective top view of myimprovedsievepr riddle. Fig. 2 is a longitudinal vertical section, and Fig. 3 isa top view of a blank punched to form one of my improved riddles.

Similar letters of reference indicate corresponding parts in all thefigures.

Ais the frame, which is of the usual shape and construction, and may beof any suitable size.

B is the sieve or riddle, of sheet metal, through which are punched orout several transverse rows of V-shaped cuts. These cuts are so arrangedwith reference to each other as to form parallel sides I) b, leaving anarrow strip of metal, a, between, so that a continuation of thesestrips will form a zigzag line reaching from one side of the frame tothe other, as shown. The points of these rows of V- shaped cuts areturned alternately in opposite directions and arranged interjacently.The tongues D of one series or row of cuts are bent downward, while thetongues or teeth 0, formed by the other row of cuts, are bent upward andalternate with the tongues D, thus forming teeth or deflectors.

The advantages of this construction and arrangement of cuts and tongueswill be pointed out hereinafter.

If any of the grain, as it is received upon the sieve, should slipbetween any two of the raised points 0 it will strike against thepointed inclined plate or part next behind, which will force it downthrough the triangular opening, where it meets an upward current of aircaused by the points D on the under side of the plate catching the airand forcing it up through the perforations in the sieve from the underside.

Thus it will be observed that the grain is subjected to the action oftwo several air-currents-an upper current, which blows in the directionof the arrow denoted by ac, and another upward current, (indicated bythe arrows marked 1,) which cuts the sheet of grain at an angle from theunder side.

It is obvious that the triangular holes of my improved sieve may be madeof any suitable size to suit different kinds of grain and grassseed.

The advantages of the foregoing structure are. first, an increasedamount of perforation is obtained second, the perforations so formed.

break joint with one another in the line or flow of the grain; and,third, the upwardly bent lips form teeth to operate on the material, andat the same time form prolongations to the downwardly-bentblast-deflecting lips.

I am aware that it is old to provide a series of upwardly-inclined wingsupon one side of the sieve and a series of downwardly-inclined wingsupon the under side of the sieve, either alternating or otherwisearranged with relation to the upper series of wings.

I am also aware that it is old to provide the sieve with a series ofdouble-inclined slats, each consisting in forming a horizontal portionof the slat with an upwardlyinclined surface at one edge and adownwardly-inclined surface or wing at its opposite edge.

Having thus described my invention, 1 claim and desire to secure byLetters Patent of the United States 7 A grain sieve or riddle consistingof a sheetmetal plate having transverse rows of sub stantially V-formedcuts with their apices my own I have hereto affixed my signature inturned alternately in opposite directions and presence of two Witnesses.interjacent, the rows of ton 'ues formed by said cuts being alternatelybznt upward and JOHN ANTHONY OLSON 5 downward to form teeth ordeflectors, substantially as described.

In testimony that I claim the foregoing as Witnesses GHRISTEE PHILLIPS,LEOPOLD BARELL.

